PCA9519BS,118

Signal Buffers, Repeaters, Splitters Overview

The PCA9519BS,118 is a four-channel level translating I²C-bus and SMBus repeater manufactured by NXP Semiconductors. It enables low-voltage processor serial buses to interface with standard I²C or SMBus I/O devices. The device provides bidirectional buffering for data (SDA) and clock (SCL) lines, allowing the high-voltage side to support a maximum capacitance of 400 pF. It operates with Port A supply voltages ranging from 1.0 V to VCC(B) - 1.5 V and Port B supply voltages from 3.0 V to 5.5 V. The component supports clock frequencies from 0 Hz to 400 kHz and features an exposed pad in its 24-VFQFN package.

Signal Buffers, Repeaters, Splitters Feature Summary

• Provides four channels of bidirectional buffering to isolate capacitance and extend bus reach.
• Translates voltage levels between low-voltage Port A and standard Port B without locking operations.
• Includes internal pull-up and pull-down mechanisms on Port A to adapt to smaller voltage swings.
• Features overvoltage tolerant pins and high-impedance states when unpowered.

Signal Buffers, Repeaters, Splitters Applications

• Interfacing low-voltage processors with standard I²C bus peripherals
• Expanding I²C bus capacity in systems requiring high capacitive loads
• Level translation between different voltage domains in SMBus applications

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify that the ordering suffix ,118 corresponds to the HVQFN-24 package configuration as specified in official documentation. Confirm that the part status remains active before procurement. Ensure compatibility with system voltage requirements, specifically that Port A operates within 1.0 V to VCC(B) - 1.5 V and Port B between 3.0 V and 5.5 V. Check for any specific handling instructions related to the exposed pad thermal design in the datasheet.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when isolation of capacitive load is required on an I²C bus. It is suitable for systems needing to bridge low-voltage logic with standard voltage interfaces. Consider the 400 pF capacitance allowance on Port B when designing bus topology. Ensure the application does not require speeds exceeding the effective limits imposed by the repeater's inherent delay at 400 kHz.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the PCA9519 family of I²C/SMBus repeaters. It is designed to overcome capacitance limitations inherent in standard I²C buses. The BS variant denotes the specific 24-pin VFQFN package option. It functions as a signal buffer and redriver, maintaining all I²C bus modes including arbitration and clock stretching during operation.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Official substitutes include other variants within the PCA9519 family such as those in TSSOP20 packaging, provided the pinout and electrical characteristics match the system requirements. Verify that any replacement maintains the four-channel architecture and compatible voltage ranges for both ports.

Signal Buffers, Repeaters, Splitters FAQ

How does the PCA9519 prevent bus lockup?

Port A uses a current sensing mechanism with a 1 mA pull-up and 200 Ω pull-down to detect low-level signals, preventing lockup conditions even with small voltage swings.

What is the maximum capacitance supported on Port B?

The device allows a maximum capacitance of 400 pF on the high-voltage side (Port B) due to its bidirectional buffering capabilities.

Are the I²C pins overvoltage tolerant?

Yes, the SDA and SCL pins on Port B are overvoltage tolerant, and the pins remain high-impedance when the device is unpowered.